Delphi DLL

Get an FTP Listing Entry's Size (32-bit)

Demonstrates the Chilkat Ftp2.GetSize method, which returns the size in bytes of a cached directory-listing entry as a 32-bit integer. The only argument is a zero-based index. It returns -1 when the index is invalid or the size is unavailable.

Background: The size comes from the cached listing, so reading it for every entry costs no extra round trips. A 32-bit result cannot represent files past about 2 GB, so use GetSize64 (or GetSizeStr) when large files are possible. Directories often report no meaningful size and come back as -1, which is why the -1 case is worth handling rather than printing blindly.

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Delphi DLL

var
success: Boolean;
ftp: HCkFtp2;
n: Integer;
i: Integer;
name: PWideChar;
fileSize: Integer;

begin
success := False;

//  Demonstrates the Ftp2.GetSize method, which returns the size in bytes of a cached
//  directory-listing entry as a 32-bit integer.  The only argument is a zero-based index.

ftp := CkFtp2_Create();

CkFtp2_putHostname(ftp,'ftp.example.com');
CkFtp2_putUsername(ftp,'myFtpLogin');

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
CkFtp2_putPassword(ftp,'myPassword');

success := CkFtp2_Connect(ftp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

success := CkFtp2_ChangeRemoteDir(ftp,'public_html');
if (success = False) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

//  GetDirCount retrieves the directory listing on the first call and returns the number of
//  entries.  A negative return indicates failure.
n := CkFtp2_GetDirCount(ftp);
if (n < 0) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

for i := 0 to n - 1 do
  begin
    name := CkFtp2__getFilename(ftp,i);

    //  GetSize returns -1 when the index is invalid or the size is unavailable (for example for a
    //  directory).  Use GetSize64 for files that may exceed 2 GB.
    fileSize := CkFtp2_GetSize(ftp,i);
    Memo1.Lines.Add(name + '  ' + IntToStr(fileSize) + ' bytes');
  end;

success := CkFtp2_Disconnect(ftp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

CkFtp2_Dispose(ftp);